Telephone-exchange system.



A. E. LUNDELL.

EUEPHONE EXCHANGE SYSTEM.

APPLICATION FILED 0CT 28, i916.

Patented Jan. 8,1918.

6 SHEETS-SHEET l.

MN VT., T\m C m E l m J D w. ,2.1/5 FW /en t. L Lynde/l A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED ocT. 2B, |916.

Patented J an. 8, 1918.

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A. ELUNDELL.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION man ocr. 28, |916.

@EN y y w N En vw@ Blur MERKEN E. r mi. we. .HQ c www h lll/ll A. E. LUNDELL.

TEl-.EPHONE EXCHANGE SYSTEM.

' APPLICATION FILED ocT. 28, 1916.

Patented Jan. 8, 1918.

6 SHEETS-SHEET 4.

www www /n Ver; for: Albe/7 E. Lande/A A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED oc. 2s, 191s.

Patented Jan. 8, 1918.

6 SHEETS-SHEET 5- NAN www

- /n Veflor: Alben E. Lande/l.

" Airy.

' AIE. LUNDI-ILL. TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED OCT. 28, I9I6 Patented Jam.l 8, 1918.

A/ben E. Lande/L 'nennst 1a. tratt., orrtnw Yoan, it. m, sssienoit 'ro sanare 'atacante comr f.:

WCORPQBTED, 0F NEW YGRK, N. Y., A COEPOEATEN @E NEW YRK.

TELEPHQEXCEANGE SYS@ masseria.

sperimenta @t amera retest.

Patented aan. e, asas.

Application filed etober 23, 1916.. Serial Efo. 128ml..

To aZfww-m it may concerne Be it known that l, ALBEN` E. L Unnnm., a citizen of the United States, residmg at New York in the county of Bronx andState of New `Xlork, have invented certain` new and useful Improvements in. Telephone-Erchange Systems, of which thefollowing 1s a full, clear, concise, and exact descrlptlon.

This invention relates to registering and controlling equipments for telephone exchange systems, and more particularly to an equi ment of this character in which qulckacting relays are employed t0 performthe functions' .previously performed by varlous types of automatic switches.

This application is in -part a continuation of the applicants previously filed applications, Serial No. 56,653l led October 19, 1915, Serial No. 57,711 iiled October 25, -1915 and Serial No. 65,986 tiled December 9, 1915, thev subject matter disclosed in such previously filed applications being also disclosed in this application. Registering and controlling devices are well-known in the art, and are used in connection with automatic telephone switches for the purpose of registering or storing the desired number and subsequently for controlling the setting of automatic switches in accordance with the number thus stored by the register. It has also been proposed heretofore to employ a registering and controlling equipment which is adapted to be set or to register the designation of the particular line which it is desired to select in accordance with one system of notation, and to provide controlling impulses arranged in accordance with another system of notation, such operation being known as translation.

In accordance with a feature of the invention, a registering and controlling device is providedin which the designation of the desired line is registered by means of relays, which relays are adapted to be operated in various combinations in registering the number of the desired line, and to control, when so operated, the production of controlling impulses whichmay be different in number and in arrangement from the number registered.

More specifically, in accordance with this feature of the invention, the designation' of the desired line is recorded by the depression of certain keys which are decimally arranged, the depression of such keys serving to energize register relays in Various combinations for registering the number recordedy on the keys. As it is desired to control selection in automatic switches in which the terminals are not arranged decimally, means are provided, operating in connection with the register relays,.totransla`te the number registered into controlling impulses which do not bear a decimal relation t0 each other. A s will more clearly appear from the detailed specification, the non-decimal arrangement of the terminals in the selector switches may necessitate a number of selective acts in the switches which is greater than the number of digits representing the desired line, and in accordance with a feature of the present invention the eXtra set of controlling impulses necessary to bring about the selection of the desired line is automatically provided by means of the reg- -istering relays in response to the operation ofl a single key for each digit of the desired number.

In the system disclosed herein with which the registering and controlling device is adapted to operate, the connector switches are each provided with terminals individual to tive hundred lines, which terminals are divided into live' groups of one hundred, which groups are subdivided into ten groups of ten units. Four of such switches thus provide the terminals for two thousand lines. The intermediate or group selectors which are used with such connector switches, are arranged to select an idle trunk in a group of trunks leading to connector switches. For example, by virtue of this method of the first selection or thousands selection is to select one of five groups of two thousand each the second selection or hundreds selection is to select one of four grou s of ve hundred in the selected group o two thousand; the third selection is lto select one of five groups of one hundred out of the selected group of five hundred; the

- grouping in a ten lthousand line exchange,

fourth selection is to select one of ten groups l of ten from-the sel w1- group of one hundred, and the fifth or nal selection is to operations, or, other words, to provide forve groups of controlling impulses, which impulses are provided for by the depression of avkey for each digit, or, in the case assumed, the depression of four keys. f In accordancel with a` related feature of Vthe invention, a group of registerv relays is provided for each digit,` and in addition rela s are provided which, although they per orm` their controlling operation independent of groups of relays, are adapted to e set in combination with such groups of relays. In accordance with this related feature of the invention, although a set of keys, or other manually operated device, is

rovided for each digit of the required numer, theregister relays maybe less in number than the number of keys, the operation of such keys lbeing arranged to cause the operation of more than one relay.

In accordance with another feature ofthe invention, in order that theregister relays may perform their registering or storing functions, a locking circuit is provided for the purpose of maintaining the relays energized in response' to the depression of the keys after the keys have been released.

In accordance with another and related feature of the invention, the locking circuit extends by -way of a contact of all of the relays energized i\n any given group, so that lit-is not completed until the last relay of f the group is energized. By virtue of this ered her mistake, by depressing the correct.

key she releases the previously depressed l key, and ,as the locking circuit for the relays controlled by the Akeys has not been established, the relay energized by the depression of thewrong key is released and is without effect.

In accordance with another feature of the invention, means are provided for releasing the depressed keys after the registering relays have performed their registering operation, and to simultaneously associate the registering relays with the apparatus to be controlled thereby in the controlling function of such relays, without delaying the controlling operation until after the keys have been released.

In accordance with a related feature of the invention, however, means are provided in case any depressed key fails to release at the proper time, thus creating an abnormal condition, whereby the controlling oper- A ation will be stopped and a signal displayed untill such abnormal condition is removed by an attendant.

i Figuresl and 2 show diagrammatically the Other features of the invention not specically mentioned abovewill more clearly appear in the detailed description and the claims. In the accompanying drawings,

circuits of an incoming selector and a connector switch; Fig. 3 shows diagrammatically a cord finder for associating the regis' tering and controlling device shown diagrammatically in Figs. 4, 5 and 6 with the selector switch shown Vin Fig. 1. Fig. 7 shows, partly in section, details of the eylocking mechanism. The complete system is disclosed with Fig. 2 placed to' ,the ri ht of Fig. 1; Fig. 3 below Fig. 1; Fig. 4 e'- low Fig. 3; Fig. 5 to the right of Fig. 4; and Fig. 6 below Fig. 4.-

In the particular system in connection with which the invention is herein disclosed, the connecting circuit shown in Fig. 1 terminates in a s electorswitch, and is extended by an inter-olice trunk to a manual operators position. In such system the manual `operator answers a call by inserting Aher answering plug in the jack of the calling line, and after ascertaining the number cmmunicatesk over a suitable order wire with an operator at a distant semiautomatic exchange, who assigns a trunk leading to a selector switch, such as' shown in Fig. 1, whereupon the operator at the manual eX"-' change inserts the calling plugvof her cord circuit intola jack leading to the other exchange. The selector and connector switches disclosed are of the panel type and are of the construction disclosed in U.' S. Patent No. 1,123,696, dated Jan. 5, 1915. The cord finder shown in Fig. 3 is also ofthe panel type and performs the same function as the cord finder disclosed in applicants .pri0r`105 Patent No. 1,168,319, patented January 18, 1916. The registering and controlling device consists of a set of keys, such as shown in Fig. 5, a plurality ofregister relays, such as shown in Fig. 4, and av'set of..counting 110 relays, as shown in Fig. 6. There are also provided in connection with various parts of the system, switches ofthe type known in the art as sequence switches, the construction of which is' well known. The various contacts operated by each of such sequence switches are` grouped adjacent to the sc quence switch, exceptin the case of the sender sequence switch shown in Fig. 3, certain of the'contacts 'individual to such sequence vswitch being shownVv on Fig. 4. In order to identify the sequenceswitch contacts with the particular sequence switch b which they are operated, the hundreds digit of the reference characters applied to all sequence switch contacts is the same as the` hundreds digit applied to #the sequence switch. Thus sequence switch contact .321, for example, is individual tothe sequence switch 3,00. v

t'is thought that the invention j.' be best understood from a description o`the operation of the system inv establishing a typical call, for example', No. 9682.

It will be assumed that the allotter shown at the right in Fig.` 3 has voperated in the usual manner and has allotted the Cord .Enden also shown in Fig. 3, for use withv the next incoming call. It will be 'further assumed that the A operator at a distant oilice'has received a call, has `communicated with the B- operator, that the two l"operators have communicated over a suitable order wire with the result that the B operator has assigned an inter-oiice trunk for the particular call, .and that the A o erator has j inserted plug of herjack, indicated ,at 1,.

into jack 2 of the inter-oce trunk.

As soon as the B operator has assigned the trunk she operates the assignment key nindicated at 101; the operation of this keycloses reaches position 2, circuit is established at contact 103 for relay 301 which circuit may be traced as follows: from battery, relay 301, contact 306 (position 1), contact 103 (position 2), left-hand armature andback contact of relay 104 to ground. Relay 301 closes at its right-hand armature and front' contact a circuit for the sequence switch 300: from battery, motormagnet of sequence switch 300, contact4 307 (position 1), front contact and armature of relay 301 to ground.

Sequence switch 300 thereupon moves intoY position 2, and in position 2 a circuit is established for the updrive magnet 302 of the cord finder indicated generally at 308, which circuit may be traced from battery, vupdrive magnet. 302, Contact 309 (position 2), front contact and armature of vrelay 301 `V to ground. 1n response to the energization of the updrive magnet 302, the brushes 310, 311 and 312 are moved over contacts 313, 314, 315 to which are connected conductors leading to the connecting circuit, shown in Fig. 1. As soon as the sequence switch;300 passes position 1% the original energizing circuit forV the relay 301 is broken at the contact 306 and thereafter the relay 301 is maintained energized by way of the contact 306 (positions 11 to 17) tothe back contact and left-hand armature of relay 303 to ground, .orwhile thel brushes of the cord finder are passing between terminals, by way of the left-hand armature and frontcontact of relay 301, commutator segments 316, brush 337 to ground. Therefore, while brushes of the cord iinder are passing over terminals which are individual to connecting circuits which have not been taken for' recaen use, the relay 301 wilt be maintained enera gi'zed and updrive magnet 302 will alsore main energized. As soon as the brush 311, however makes contact with the terminal 314, individual to the connecting circuit shown in Fig. 1, a circuit is established for magnet 303 which may be traced as ollows from battery,`relay 303, contact 317 (position 2), brush 311, termmal 31-1, contact 105 (position 2 back contact and right-hand armature o relay 106, contact 107 (position 2) to ground. The lrelay 303 when energized` opens `at its left-hand armature one of the -energizing circuits for the relay 301, which relay will, however, remain energized over its alternative circuit until the brushes' arey'accurately centered upon the terminals.

selected when such alternative circuit wil` be :opened by' the brush 337 making contact .with an msulated segment of the commutator'316.4 When the relay 301 is thus denerglzed the updrivlng magnet 302 is dener- Lgized and the cord finder stopped by the a circuit for'the sequence switch 300, which may be traced from battery, motor magnet of sequence switch 300, contact 307 (position 2), back contact and right-hand armature of relay 301 to ground, whereupon sequence switch 300 moves into position 3, in which position such sequence switch will wait until the .operator has set up the desired number on vthe sender shown in Figs. 4: and 5.

While the sequence switch 100, individual to the connectin a circuit is esta lished for the lamp 103 which may be traced from battery through the lamp' 108, contact 109, in position 2, to ground. This lamp remains v illuminated until the fundamental circuit is extended from the operators sending device to the selector switch associated Withthe connecting circuit. c

Also, as soon as the relay 303 is opeiated, a circuit is vestablished for relay 10a which may be traced from battery, relay 303, contact 317 (position 2), right armature and 2), relay 104, .contact 112 (position 2),/to ground. When the relay 104 is operated it `connects ground to its previously traced energizing circuit at its left-hand armature and front contact, as a substitute for the the disconnection, and as such disconnection forms no part of the present invention this subsequent operation of relayA 104 need not be considered.

vWhile the cord inder is hunting for the circuit, is in position 2,V

k11.5 .front contact'of relay 303, brush 310, termi nal 313, conductor 110, contact 111 (position cord, the operator may be employed in set- 1810 in the units row. These keys are latched in their depressed positions by. latches controlled by the magnets indicated atI 496. As a result of the depression of these keys the following circuits are established: from battery to contact 318 (position 2), contact 4 of the allotter (position 1), relay 5, contact 6 of the allotter (position 1), conductor 7, contact 362 (position 3), contact 319of the sequence switch 300 (position 3), conductor 433, left-hand windlng of relay 400, conductor 434 to the upper contact of No. 9 key in the thousands row, and to ground#A at 435; from battery, contact 318 (position 3 contact 4, relay '5, contact 6, conductor contact 362 (position 3), contact 319, (position 3), conductor 436, left-hand winding of relay 432, conductor 437, the lower contact of the No. 9 key in the thousands row, to ground at 435; from battery, contact 318 (position 3), contact 4, relay 5, conductor contact 362 (position 3), contact 320 (pos1-- tion 3), conductor 439, left-hand winding of relay 408, conductor 440, upper/contact of the No. 6 key in the hundreds row to ground at 435; from battery to contact 318 (position 3), Contact 4, relay 5, contact 6, conductor 7, contact 319 (position 3), conductor 441, right-hand windlng of relay 430, conductor 442, lower contact of No; 6 key in the hundreds row to ground at 435; from battery, contact 318 (position 3), contact 4, relay 5, contact 6, conductor 7, contact 362 (position 3), contact 321, conductor 443, left-hand winding of the relay 411, conductor444, No. 8 key 1n the tens row, to ground at 435 from battery to contact 318 (position 3), contact 4, relay 5, contact 6, conductor 7, contact 362 (position 3), contact 322 (position 3), conductor 445, left-hand winding of relay 427, conductor 446, No. 2 key of the units row, to ground at 435. The relays 400, 432, 408, 430, 411 and 427 of the register and the relay 5 of the allotter are energized in these circuits. Relay 5 closes at its righthand armature and contact a substitute circuit for the energized register relays independent of the battery at contact 318 in positions 1 to 3. This circuit extends from battery, right-hand armature and contact of relay 5, allotter contact 4 (position l), relay 5, allotter `:ontact 6 (position 1), and thence to ground atthe depressed keys by way of the ener ized register relays as previously traced. glherefore, in case all the keys are not released when the sequence switch 300 reaches position 4, the relay 5 is maintained energized and ythe circuit which drives the sequence switch 300 out of positlon 4 1s held open at the back contact and left amature of the relay 5. Relay 430 energized in the circuits above traced closes a circuit from battery, left-hand armature and front con` tact thereof, relay 431 to ground, thus energizing relay 431. When the register relays are energized inv the :circuits above traced, two locking circuits for such energized relays are established; which locking circuits include the relays 304 and 305. The first of these locking circuits, which is established as soon as tens and units register relays have been operated, extends from battery indicated at 447, by way of the conthe relays 400, 432, 408 and 430 energized,-

the following circuit is established: from battery (Fig. 4) to the left-hand Windin of the relay 430, conductor 453, right-han Winding of the relay 400, contact and righthand armature thereof, to conductor 454, through the right-hand lwinding of relay 432, conductor 455, right-hand Winding of the relay408, contact and right-hand armature thereof, conductor 456, relay 305, armature and contact of 304, to ground. As the result of the establishment of these circuits just traced, relays 400, 432,408, 430, 411 and 427 are locked, and the relays 304 and 305 are both energized. With relay 305 energized a circuit is established for the sequence switch 300 which may be traced from,

the battery to the motor magnet of sequence switch 300, armature and contact'of rela 305, contact 323 (position 3) to thegrpun With the sequence switch 300 in position 4, a circuit is established for the release magnets 496, which when operated cause the release of all the depressed keys, this release circuit may be traced from battery,

contact 318 (position 4), conductor 477, release magnets 496 in parallel to gro'und. Also in position 4 of the sequence switch 300, a circuit is established for the motor magnet 8 of the allotter, which may be traced from battery to the motor magnet 8 of the allotter, contact 329 in position 4, conductor 330, allotter contact 9 in position 1 to ground. The allotter thereupon moves into position 2. In position 2 of the allotter, assuming that the keys have been restored, the relay 5 is deenergized and a circuit is established to drive the sequence switch 300 into osition 5, which circuit may be traced from attery, through the motor magnet of the sequence switch 300, contact 331 in` position 4, left recaen 300, and in position 2 of the sequence switch ,100, the so-called fundamental circuit leading lto the first selector switch is established. This circuit may be traced from battery (Fi 1) to the winding of line relay 113 of t e first selector switch, contact 114 (position'2), conductor 115, terminal 315, brush 312, contact 324 (positions 4 and 5), stepping relay 325, conductor 457 to the back contact and armature of the 0 counting relay to ground.

Before describing the details of the se-j lecting` operation which is now ready to take place, it may be well to consider-justA what selective acts are imposed upon the system by the grouping of the lines therein, in order to select the desired number, namely, 9682. As the lines are divided into five groups of 2,000 each, in order to reach the group containing 9682 it will be necessary to select the fifth or llast group. Therefore, the controlling impulses for the first selection will be five in number. Having selected the required group of 2,000, the next selection will be one of four groups of 500 in such two thousand which, in the case of the particular number under consideration, will be in the group from 9,500 to 9,999. This will be the fourth group of the group from 8,000 to 9,999, and four controlling impulses will be required. As the required number will fall in the hundreds group eX- tending from 9,600 to 9,699, which is a second group of the thousands group 9,600 to 9,999, two controlling impulses will be re quired, and to select the eighth tens group and second units group nine and three controlling impulses respectively will be required. Thus it will be seen that five sets of impulses are required to select the desired number, being five, four, two, nine and three. These impulses are all provided by the depression of four keys, that is, No. 9 in the thousands row, No. 6. key in the hundreds row, No. 8 key in the tens row and No. 2 key in the units row.

The relay 113 energized in the fundamental circuit above traced, closed at its right armature and front contact, circuit of thesequence switch 100 which may be traced from .battery to the motor magnet of sequence switch 100, contact 116 (position 2) front Contact and armature of relav 113 tov ground, whereupon the sequence switch 100 is driven into position 3. With the sequenceI switch 100 in position 3 and relay 113 still energized a circuit is established for the updvive magnet 117 of the first selector switch. This circuit may be traced from battery,

` magnet 117, contact 118 (position 3), conductor 142, front contact and armature of relay 113 to ground. The elevator rod 119 of the first selector, which carries the brushes indicated at 120, 121 and .122, and also the commutator brushes indicated at 123, moves upward. As soon as the second brush to the left of the set of brushes 123 engages the rst segment of the commutator segment 124, the stepping relay 325 in the fundamental circuit is shunted by the following path: from battery, relay 113, contact 114 (position 2), conductor 125, contact 126 (position 3), conductor 127, commutator segment 124, interrupter brush 123, conductor 128, contact 129 (position 3) to the ground.-

-;"Returning now to the operation of the stepping relay 325, when this relay was first energized, when the fundamental circuit was established, with register relay 400 locked up, a circuit was established from battery through theNo. 4 counting relay, armature and back contact of the No. 4 counting relay, conductor 458, contact and left armature of relay 400, conductor 459, contact 326 (position 4), contact 327 (position 4), armature and Contact of rela-y 325 to ground. As soon as the No. 4 counting relay is energized a circuit is established for the No. 4 relay, which may be traced from battery (Fig. 4), No. 4 relay, No. 4 relay, armature and contact of No. 4 relay, conductor 460, contact 328 (position 4) to ground. When the interrupter brush of the selector switch passes over the first segment of commutator 124 as above described, the relay 325 is shunted. Upon the second energization of the relay 325, counting relay No. 4 being energized, the original energizing circuit for the counting relay No. 4 is transferred by the front contact and armature of No. 4 relay and back contact and armature of N o. 3 relay to the No. 3 relay, which thereupon becomes energized and, as in the case of No. 4 and No. 4 relays, as soon as the No. 3 relay is energized, an energizing circuit is established for the No. 3"relay.

Thus after every energization and denergization of the stepping relay 325 a pair of counting relays is energized, and as No. 4 counting relay was first energized, after five energizations and denergizations of the relay 325 due to five shuntings thereof at the commutator 124, the last or the No. O counting relay will be energized. This relay when energized opens at its back contact the previously traced fundamental circuit. As soon as the fundamental circuit is opened the relays 325 and 113 included in such circuit are denergized. The relay 113 when denergized also opens the previously traced circuit for the updrive magnet 117. The relay 113 when denergized closes at its righthand armature and back contact a circuit for the sequence switch 100 which may be traced from battery, to the motor magnet of sequence switch 100, Contact 198 in position 3, back contact and right armature of relay 113 to ground, whereupon the sequence switch 100 moves into'posltion 4. When the No. O relayl attracted its armature and front contact and armature of the No. 0

opened the fundamental circuit, a circuit was also closed for the sequence switch 300 counting relay to ground. As. soon as the sequence switch 100 is driven mto position 4, due to the denergization of the relay 1 13, a circuit is established for the brush tr1pping magnet indicated at 130. This circuit -mutator segments 131. `magnet 325 is energized and denergize may be traced from battery, through the brush tripping magnet 130, contact 129 1n position 4 to ground. As the brush tr1p ping magnet is thus energized immediately after five impulses are sent back to the sender, the tripping magnet 130 operates to trip the fifth set of brushes, which is assumed to be the set indicated on the drawing at 120, 121 and 122. With the sequence swltch 300 in position 7, and 100 in position 4, the fundamental circuit isagairr established, which fundamental circuit maybe traced from battery, through relay 113, contact 114 in position 4, conductor 115, terminal 315, brush 312, contact 324 in position 7, stepping relay 325, conductor 457 to the back contact and armature of the No. 0 counting relay, which relay has been denergized, due to the opening of its circuit at the contact 328, when the sequence switch 300 left position 5. As before, the stepping relay 325 and the line relay 113 are energized in this fundamental circuit. Relay 113 when energized closes. at its right-hand armature and front contact a circuit to drive the sequencevswitch 100 from position 4 to position 5. vThis circuit may be traced from battery, through the motor magnet of sequence switch 100, contact 116 (position 4), front contact and right armature of relay 113, to ground. The relay 113 also reestablishes the circuit previously traced for the updrive magnet 117. In position 5 of the sequence switch 100, a shunt circuit for the relay 325 isestablished as soon as the relay 113 is energized, from battery, through the relay 113, front contact and left armature of such relay, contact 114 (position 5), conductor 125, 'contact 126 (position 5), commutator segment 1,31, brush to ground. This shunt circuit is established and interrupted as the shaft 119 is moved upward by the left-hand brush of the set of interrupter brushes 123 in passing over the com- Thus the stepping a number of times, determined by the number of the counting relayfenergized when the fundamental circuit is first established.

In position 7 of the sequence switch 300, 'as soon as the relay 325 is energized, with the relays 431 and 432 energized, a circuit is established for the No. 3 counting relay, which circuit may be traced from battery (Fig. 6) throu h the No. 3 counting relay, armature and ack contact of the No. 3 counting relay,-conductor 462, conductor 463, right-hand armature and front contact of relay 431, front contact and left-hand armature of relay 432, conductor 464, contact 326 (position 7), contact 327 (position 7 armature and contact of relay 325 to ground. With the No. 3 counting relay thus energized, after the relay 325 has been energized and denergized four times, the No. 0 counting relay will be energized and will open at its back contact the fundamental clrcuit. The opening of the fundamental circuit causes the denergization of the relay 113 which relay opens at its front contact the circuit of the updrive magnet 117 and closes at its back contact a circuit to drive the sequence switch 100 into position 6, which circuit may be traced from battery, through the motor magnet of sequence switch --100 in position 5, contact 198 in position 5, back contact and armature of relay 113 to ground. The No. 0 counting relay also closes at its front contact a circuit to drive the sequence switch 300 out of position 7 into position 9, which circuit may be traced from battery, through the motor magnet of thesequence switch 300, contact 331 (position 7), conductor 461, front contact and armature of the 0 counting relay to ground. When the sequence switch 300 leaves position the energizing circuit for the counting rel ys, by way of the conductor 460, is opened,

ermitting such counting relays to restore.

With the sequence switch 100 in position 6, a circuit is established for the test relay 106 which may be traced from battery through the right-hand winding of relay 106, contact 133 (position 6) to ground. Relay`106, when energized, establishes a circuit to drive the sequence switch 100 into position 7, which circuit extends from battery through the motor magnet of sequence switch'100, contact 116 (position 6) lefthand armature and front Contact of relay 106, contact 107 (position 6) to ground, In position 7 of theV sequence switch. 100, with the relay 106 energized, a circuit is established for the updrive magnet 117 of thefirst selector switch, which starts such selector switch in its trunk-hunting operation. This circuit extends from battery through the updrive magnet 117, contact 118 (position 7), contact 116 (position 7 left-hand armature and front contact of relay 106. contact 107 (position 7) to ground. During the. hunting operation, the test relay 106 is maintained energized as long as the test stationary contacts until a test contact is `lay 113, a circuit iaestab U passing over terminals of busy lines by either of the-two following circuits, one of which is eiective while the brushes '121 are Y f right armature of relayv 113 to ground.- The actually in contact with the terminals o busy lines, and the other of ,which is maintained at all times while the brushes are passing. between trunk terminals. The iirst of these circuits extendsl from battery:

through the left-hand winding of relay 106, contact134 (position 7), right-hand arrrlay4 ture and front contact of relay 106, conductor 135, test brush 121, test terminalI 136,l

armature and back contact of relay 201, contact 202, (which contact, in case the trunk to which it is individual leads to a` busy final selector switch, is closed), to'ground. If the articular trunk is idle, the contact 202 will) be opened. The second energizing circuit of the relay 106 extends from battery through the right-hand winding ofthe relayv 106, contact 133 (position 7 conductor 137 commutator segment 138, and thence by way of the third brush of the set of interruptor brushes 123, contact 116 (position 7), front contact and left-hand armature of relayr 106, contact v107 (position 7), to ground. The brushes therefore will be moved over the encountered which is individual to a trunk leading to an idle nal selector, when the rst energizing circuit for the relay 106 will be found open at contact 202. As soon as the second energizing circuit for the ,test relay 106 is o ened at the commutator 108 when the brus es are centered on the terminals, relay 106 will release. r1he release of the relay 106 opens the previously traced energizing circuit for the updrive magnet 117, stopping the elevator shaft 119 with thev brushes 121 and 122 in contact with the terminals indicated at 136, 139 and 140. The relay 106, when released, also closes at its left-hand armature and bach Contact acircuit to drive the sequence switch `100from position 7 to position 8. This circuit may be traced from battery-through the motor nuag-l net of sequence switch 100, contact 141 (position 7), back contact and armature of relay 106, contact 107 to ground. t

`With the sequence switch 100 in position 8, sequence switch 300 in position 9, and the sequence switch 200 in Vposition 1, after the rst selector has operated to select a trunk leading to an idle final selector, the fundamental circuit is again established. rl-his circuit may be traced from battery, through the relay 113, contact 114 (positions 2 to 13), conductor 115, terminal 315, brush 312, contact 324 (position 9), stepping relay 325, conductor 457, to the back contact and armature of theNo. 0 counting relay. The re'- lays 113 and 325 are energized in this circuit. As a result of the energizaton of ret0 drive the f sequene switch 100 intofposition 9, which circuit ,extends from battery, through the motor l'nagnetl of sequence switch '100,' conl tact 116.l (position 8), front contact and..

relay 113 also closes at its right-hand armature, a Acircuit for the relay 203, which circuitextends from battery, through the' con'- tact204(position1), right-hand Winding of the relay 203, contact 205 (position 1), trunk 'conductor 206, terminal 139brush 120, contact 118 (position 9), conductor 142 front. 'i

contact and right-hand armature ofv relay 113 to ground. As a result of the energiza f'tion' of relay 203, a circuit is established for the relay 201 `from battery, through rela 201, contact 207 (position 1), front contac and left-hand. armature of relayl 202 tov ground. The relay- 201 when actuated 'closest vposition 2, which circuit 'extends from bat-v lter through motor magnet of sequence.

acircuit to drive sequence Switch -200 into established for the high speed updrive magnet 209 of the final selector, which circuit extends from battery, through the magnet 209, contact 210 (position 2), front contact and right armature of the relay 203, Contact `205 (position 2), conductor 206, terminal 139, brush 120, contact 118 (position 9), conductor 142, front contact and armature of relay 113 to ground. Relay 113, after the rsequence switch 100 reaches position 9, is `maintained energized during the movement fof the elevator rod 211 of the nal. selector switch, while the second brush oi the 'set of commutator brushes indicated at 212 passes over the commutator segment 213. r1he -energizing circuit for'the relay113 may be traced from battery, through the relay 113, left armature and front contact thereof, con tact 114 (position 9), conductor 143, brush 122, terminal 140, conductor 213, contact 214 (position 2), contact 215 (position 2), to the commutator 213 and second brush in the set of interrupter brushes 212 to ground. r1`his holdingy circuit for the relay 113 when -established by the commutatorbrush movof the No. 1 counting relay, conductor l465', 4

from batter l(Fig.` 6), through the No.' 1

counting re ay, back contact and amature front contact and left-hand armature of the register relay 408 to conductor 466, con' tact 326 (position 9) contact 327 in position 9, and armature and front contact of relay 325 to ground. After the interrupter brushes 114'have passed over two segments ofthe commutator 113, and consequently after two shuntings of the 4relay 325, the No. 0 counting relay is energized, and opens the fundamentalcircuit, causing the denergization of the relays 113325. The energization of thev No. 0 counting relay also closes a circuit to drive the sequence switch 300 from position 9 to position 11, which circuit may be traced from battery, through the motor magnet -of sequencg switch 300, contact 331 (position 9), conductor 461 to the front contact and armature ofthe No. 0 counting relay to ground.

As the sequence switch 300 leaves position I 113 alsoA opens the circuit Apreviously traced' for the high speed updrive magnet 209 of the final selector switch, and also the circuit previously traced for the relay 203. Relay 203 when released closes at its back contact and left armature a circuit to drive the sequence switch 200 into position 3. This circuit may be traced from battery, through the motor magnet of sequence switch 200, contact 207 (position 2),"back contact and left armature of the relay 203 to ground. When the sequence switch 200 reaches position 3, a circuit is established for the brush tripping magnet 216, which extends from` battery, through the tripping magnet 216, contact 217 (position 3), to ground. The tripping magnet when operated at this time is arranged so that when the elevator 211 again moves upward, the second set of brushes carried' by the elevator 211 will be tripped and rendered active. It will be assumed that such set of brushes are those indicated at 218, 219 and 220.

With the sequence switch 300 in position 11, the sequence switch 100 in position 10, and the sequence switch 200 (position 3), and the counting relays released, the fundamental circuit is again established for the purpose of controlling the tens selection, which fundamental circuit may be traced from battery, through the relay 113, contact 114l (position 10), conductor 115, terminal 315, brush 312, contact 324 (position 11),

Steppinl relay 325, conductor 457, back contact an armature of the No. 0 counting rei established to drive the sequence switc 100 into position 11, which circuit extends rom battery, through the motor magnet of the seguence switch 100, contact 116' (position 10),

ront contact and right armature of relay 113 to ground. As soon as the sequence switch 100 reaches position l1, the following circuit is established from battery, contact 204 (position 3), right-hand winding of relay 203, contact 205 (position 3), trunk conductor 206, terminal 139, brush 120, contact 118 (position 11) ,conductor 142,front contact and right armature` of relay 113 to ground. The energization of the relay 203 closes a circuit to drive the sequence switch 200 into position 4, which circuit extends from battery, through the motor magnet of sequence switch 200, contact 207 (position 3) left armature and front contact of 203 to ground. With the sequence switch 200 in position 4, a circuit is established for the high speed vupdrive magnet 209 of the final selector,

which circuit extends from battery, through motor magnet 209, contact 210 (position 4), right. armature and front contact of relay 203, conductor 205 (position 4), trunk conductor 206, terminal 139, brush 120, contact 118 (position 11), conductor 142, front contact and right armature of the relay 113 to ground. A shunt circuit in derivation of the fundamental circuit is also established at this time, which circuit extends from battery, throughthe relay 113, contact and left armature thereof, contact 114 (position 11), conductor 143, brush 122, terminal 140, conductor 213, contact 214 (position 4), contact 215 (position 4) ,to commutator segment 221., and by way of the rst set of the set of' interrupter brushes 212 to ground. Therefore, as the elevator rod 211 is driven upward, the interrupter brushes passing over the commutator 221 will intermittently shuntthe stepping relay 325 a number of times, depending upon the particular counting relay which has been energized. Re-

turning now to the first energization of the relay 325, when the fundamental circuit was again established with the registerl relay 411 energized, a circuit is established for the No.

8 counting relay which may be traced from tatami zation of the `No. 0 counting relay. The

opening of the fundamental circuit causes the denergization of the relays 113 and 325. The energization of the relay` 0 at this time establishes a circuit to drive the sequence switch 300 into position 13, which circuit may be traced from battery, through the motor magnet of the sequence switch 300, contact 331 (position 11), conductor 461, front contact and armature of the No. 0 counting relay to ground. The denergization of the relay 113 opens the previously traced circuits for the updrive magnet 209 and for the relay 203. The relay 113 when released also closes a circuit to drive the sequence switch 100 into position 12, which circuit may be traced from battery, through the motor magnet of sequence switch 100, contact 198 (position 11), back contact and right armature of the relay 113 to ground. The denergization of the relay 203 establishes a circuit to drive the sequence switch 200 into position 5, which ci:- cuit extendsy from battery, through the motor magnet of sequence switch 200, contact 207 (position 4), back contact and lefthand amature of the relay 203 to ground.

With the sequence switch 300 in position 13, the sequence switch 100 in position 12, and the sequence switch 200 in position 5, a fundamental circuit is again established to control the units selection. This fundamental circuit may be traced from battery, through the relay 113, contact 114 (position 12), conductor 115,'terminal 315, brush 312,

- Contact 324 (position 13), stepping relay 325, conductor 457, back contact and armature of the No. 0 counting relay to ground. Relays 113 and 325 are energized in this circuit as usual. The energization of the relay 113 at this time establishes a circuit to drive the sequence switch 100 from position 12 into position 13, which circuit extends from battery, through the motor magnet of the sequence switch 100, contact 116 in position 12, front contact and right-hand armaturefof the relay 113 to ground. With the sequence switch 100 in position 13, aild the sequence switch 200 in position 5, a circuit is established for the relay 203, which extends from battery, through the contact 204 (position 5), right-hand winding of the relay 203, contact 205 (position 5), conductor 206, terminal 139, brush 120,'contact 118 (position 13), front contact and right-hand armature of the relay 113 to ground. The relay 203 when energized establishes a circuit to drive the sequence switch 200 from position 5 to position 6, which circuit extends from battery, through the motor magnet of the sequence switch 200, contact 207 (position 5), front contact and left armature of the relay 203 to ground. With the sequence switch 200 in position 5, a circuit is established from a slow-speed updrive magnet 222, which circuit may be traced from battery, throu h the magnet 222, contact 210 (position 6?, front. contact and ri ht-hand armature o relay 203, contact 205 position 6), trunk conductor 206, terminal 139, brush 120, contact 118 in position 13, conductor 142, front contact and armature of the relay 113 to ground. With the relay 113 energized, Va shunt circuit in derivation of the fundamental circuit is established including the commutator 223 of the final selector switch, lwhich circuit extends from battery, through the relay 113, front contact and left armature thereof, contact 114 (position 13), conductor 143, brush 122, terminal 140, conductor 213, contact 214 (in position 6), contact 215 (position 6), commutator 213 to ground, through the middle brush of the set of interrupter brushes indicated at 212. yIn the meanwhile, when relay 325 is energized, and with the register relay 427 energized, a circuit is established for the No. 2 counting relay, which circuit extends from battery, through the No. 2 counting relay, arma-ture and back contact of the No'. 2 counting relay, conductor 469, front contact and righthand armature of the relay 427, conductor 470, contact 327 (position 13), armature and front contact of the relay 325 to ground. Therefore, after three shuntings ofthe relay 325, the fundamental circuit is opened by the energization of the No. O relay,

causing the denergization of the relays 113 and 325. The relay 0 closes at its front contact a circuit to drive the sequence switch 300 out of position 13 into position 16. This Ycircuit extends from battery, through the extends from battery, through the 'motor magnet of sequence switch 300, contact 307 (position 16), back contact and armature of relay 303 to ground. In position 17 of the sequence switch 300, a circuit is. established for the downdrive magnet of the cord finder, which restores such cord finder to normal position. This circuit extends from battery, through the downdrive magnet 332, contact 306 (position 17), back contact and armature of relay 303 to ground. When the cord finder has completely restored, the brush 337 makes contact with the contact 333, when a circuit is established to drive the sequence switch 300 from position 17 to position 18. This circuit extends from battery, through the se uence switch 300, contact 334 osition 1 ,contact 333, and brush 31 to I :in/'position 18 until the allotter allots the 'l cord finder for use in another connection.

VVith the cord finder restored to normal position, the registering and controlling equipment is disconnected from thevconnecting circuit. In the meantime the openipg of 'the fundamental circuit has caused the 'brushes' of the final selector to stop in 4contact with the terminals of the desired line. It will be recollected that whenl the fundamental circuit Vwas opened at the counting relays, relay 113 ywas denergized, opening at its front contact and right armature, previously traced. circuit for the relay`208 and the updrive magnet 222. Relay 113 also closes at` its back contact a circuit to drive the sequencey switch 100out of position 13 into position 14, which circuit extends from battery to the motor magnet of the sequence switch 100, contact 198I (position 13), back `contact and right armature of. relay 113 to y ground. The denergization of the relay203 establishes a circuit to drive sequence switchy 200 from 'position 6 into position 7, which circuit extends from Vbattery through the motor magnet of the sequence switch 200, contact 207 (position 6), back contact and left armature of relay 203 to ground.

As the invention claimed in this application has todo with the operation of the registering and sending device and is not concerned with the operations of the system after such registerin and sending device has been disconnected groin the connection being established, it is thought to be unnecessary to describe the testing operation and subsequent operations atthe final selector switch or to describe such operations as supervision and disconnect which9 take place independently of, and after the operation of the registeringand sending device.

A complete-connection has been traced in detail inv which all of the selecting operations necessary in extending the connection to a typical line have been described. It is, therefore, thought that no difficulty should be encountered in understanding just how connections to other lines may be extended. The only difference in the operation being that the register relays are operated in dif.

ferent .combinations to provide the necessary impulse combination to selecta particular line. In all cases, however, the extra set of impulses will be controlled by means of the relays 430, 431 and 432.

In addition to illustrating the feature of translation in the registering and controllin equipment, the normal connection trace above will also serve to illustrate certain other features of the invention. For example, from the connection traced it may be `observed that'the locking circuit for the various registering relays extends by way of an armature and contact of each of the renaeaeir .which position the keys are also released.

This fundamental circuit is also maintained in position 5 of the sequence switch' 300, to which position the sequence switch moves as soon as the keys are released. It has heretofore been the practice to delay the 'first selective operation until after the keys have `been released, which delay involved the loss `of a'certain amount of time in establishing a connection. p

Attention may be directed at this point to the fact that the particular form of key 'which is adapted to be used with theregistering and controlling equipment'disclosed is of the type in which the depression of any key mechanically releases previously depressed keys in the same row. A key structure of this type is illustrated in Fig. 7, but as such structure is well-known, it is not deemed necessary to describe it in detail. As keys ofthis type are employed and-as the locking circuit of the relays which are en ergized in response to the operation of the keys is not closed until the last relay has been operated, hence until the last key has been depressed, it is possible for the operator to change the designation represented by the keys operated. Therefore, if the operator should make a mistake in de res'sing the keys, this mistake may be recti ed provided it is discovered before the last key is depressed. For example, if the operator h'ad, in Yresponse to the request for line No. 9682, depressed No. 9 key in the thousands row, No. 7 key in the hundreds row and No. 7 key in the tens row," and then discovered her mistake, this mistake could be rectified by pressing the No. 6 key in the hundreds row andothe, No. 8 key in the tens row, which act would mechamcally release the keys depressed in error, and, as the locking circuits had not been established for the corresponding registering relays, such registering relays would be denergized.

It may also occur under abnormal conditions that a key will fail to release in response to the energization of the release magnets 456 when the sequence switch 300 reaches position 4, in which case, if the call were permitted to proceed, a subsequent connection might be mutilated. It is always advisable in telephone exchange systems to remove an abnormal condition as soon as possible after such condition arises. Therefore, in accordancewith the system disthe selection in case an abnormal condition, such as above described, shouldA develop. It will be recalled that the rel'ay of the allotter is energized over a circuit which extends in parallel through all of the depressed' keys, and also thaty the sequence switch 300 cannot leave position 4 until the relay 5 is deenergized. Therefore, in case a key fails to restore in response to the energization of the release magnets, the relay 5 remains ener-y gized, and the sequence Switch 300 will remain in position 4. From positions 2 to 4 of the sequence switch 300 the lamp 363 is illuminated by a' circuit which extends from' battery by way of contact 364 to ground. Consequently, if this lamp remains illuminated for an abnormal period, as would be the case when a key fails to restore, the operator will notify an attendant of the abnormal condition, and such attendant may then locate the faulty key and remove such abnormal condition.

While the registering and controlling equipment, shown in Figs. 3, 4, 5 and 6, has been described in connection with the particular system disclosed in Figs. 1 and 2, it will be obvious to any one skilled in the art that the registering and controlling equipment may be associated with systems widely I varying in character, without departing from the spirit of the invention.

What is claimed is:

l. A registering and controlling equipment for telephone exchange systems comprising a plurality of setsvof register relays, a manually operable device for each digit of the greatest number it is desired to register, certain of such register relays being operated in response to the operation of such manually operable devices to control the production of a set of impulses for each digit of the number registered, and means associated with such relays for controlling the production of an additional set of impulses.

2. A registering and controlling equipment for telephone exchange systems comprising a plurality of sets of register relays, a manually operable device for each digit of the greatest number it is desired to register, such register relays being selectively operated in response to the operation of said manually operable devices and when so operated serving to controlthe production of a set of controlling impulses for each digit of the number represented by the operation of such devices, and means controlled from such manually operable device for controlling tlie production of an additionalset of impulses independent of such register relays.

3. A registering and controlling equipment for telephone exchange systems comprising a set of keys for each digit of the greatest number it is desired to register, a set of register relays foreach set of keys adapted to be selectively operated in response to the operation of such keys and to control the production of a set of controlling impulses for each set of relays, and additlonal relays also controlled by the operation of such keys to produce an additional set of controlling impulses.

4. In a registering and controlling equipment for telephone exchange systems, a plurality of sets of keys, a corresponding plurality of sets of register relays,.means controlled by the operation of any one of a plurality of keys in a set of keys to select a. relay of the corresponding set of register relays, additional relays, means controlled by the operation vof the same one of the same of keys for each digit ofthe number itis desired to register, a corresponding set of register 'relays one of which may be selected by the operation of either one of a pair of keys, an additional relay the operation of which is determined by the particular key operated in such pair, and means controlled by the selected register,',frelay'. and the additional lrelay to control selection in an automatic switch in accordance with the number represented by the operated key.

6. A registering and controlling equipment for telephone exchange systems comprising keys adapted to beset by the operator'in combinations to represent any line number of the system, a register relay circuit associated with said keys and having a plurality of relays therein less in num er than the number of keys and selectively operable in groups in response to the combinations of keys setby the operator, and lockone of the selectively operable group of relays, whereby the group of relays is held in operated position lrrespective of the subsequent condition of the keys.

7. A registering and controlling equipment for telephone exchange systems comprising keys adapted to be set by theoperator in combinations to represent any line number o f the system, a register relay circuit associated with said keys and having a plurality of relays therein arranged in groups, said relays being selectively operable in combinations corresponding to the combinations of keys depressed by the operator, and locking means for the operated combination of relays operating upon the energization of lthe last one of the selected combination of relays whereby the combinalig.

tion of relays is held in operated position irrespective of the subsequent condition of j operator, said register relay circuit comprising a plurality of relays arranged in groups and adapted to be .operated in predetermined combinations, each relay having a locking winding associated therewith, locking circuits including said locking windings, said locking circuits bein pleted to maintain the energized re ays in their operated position'only after the energization of the last relay of the selected combination.

9. In a telephone exchange system, a controlling device comprising a plurality of sets ofkeys adapted to be depressed in va- Y rying combinations, means for locking the depressed keys, electromagnetic releasing means for unlocking said keys, a selection controlling circuit eading from said controlling device to the 'apparatus 'controlledthereby, and means responsive to the depression of the last key to establish immediately thereafter the selecting circuit and a circult for such velectromagnetic `key releasing means.

l0. In a telephone exchange system, a re istering and controlling equipment inclu ing a plurality of keys adapted to be operated in various combinations to correspond with the number of any subscriber in the system, a register relay circuit having a plurality of relays therein operated. in predetermined groups in response to the depression of a combination of keys by an operator for registering the number corresponding thereto, meansfor mechanically locking the operated keys in their depressed position, electrical meansfor ,releasing the depressed keys, ya selecting circuit, and 'means for simultaneously operating the key releasing means and closing the selecting circuit. 4

11. In a telephone exchange system, registering and controlling equipment including a plurality of keys adapted to be operated in varying combinations to correspond with the number of any subscriber in the system, a register relay circuit having a plurality of relays therein operated in predetermined groups in response to the depression of a combination of keys by the operator for registeringv the number corresponding thereto, means for mechanically locking the operated keys in their depressed position, electrical means for releasing the com- Laeasil by the selecting circuit;

. 12. yIn a telephone exchange System, a registering and controlling equipment including a plurality of keys adapted to be operated in varying combinations to cori' respond with the number of any subscriber' in the system, a register relay circuit havinga plurality of relays therein operated in predetermined groups 1n response to the depression of a combination of keys by the operator for registering the number corresponding thereto, means for mechanically locking the operated keys in their depressed position, electrical means for releasing the depressed keys, a selectin for simultaneously operating the key-releasing means and closing the selecting circircuit, means cuit, and a counting relay circuit indirectly controlled by the register relay circuitand directly`controlled by the selecting circuit.

13. In a semi-automatic telephone exchange system, the combination with a plurality of register relays, of a plurality oliv manually operated devices for selecting predetermined groups of said plurality of register relays, said selected group corresponding to the combination of manually oper,

ated devices, means for allowing the designation determined .by the plurality of man-v change system, a plurality of series of regl ister relays, a plurality of rows of keys, said rows corresponding in numberto the number of the series of register relays and operating, when a key of each row is depressed, to energize a predetermined group of register relays, one or more relays for each series of relays being energized.y to form the group of relays, the group of relays being completed only upon the energization of the-last relay of the group, a locking circuit for said group of' relays completed only when the last relay of the group is energized, whereby the line designation may be altered at any time previous to the closing of said circuit.

15. In a telephone exchange system, acontrolling device comprising a plurality of sets of keys, means for locking operated keys in operated position, means for releasing said keys and restoring them to non-operated position, and means controlled by the operation of any key serving to stop the controlling operation of the controlling device until all the keys are restored to non-operated position. y

istering and controlling equipment, a plurality of registerin'gdand controlling devices,

a plurality of keys adapted to be operated to selectively control the registering operation of such registering and controlling devices, an automatic switch for associating such registering and controllin devices with the apparatus to be contro ed thereby, means ior restoring the operated keys, and means operated by the depression of` any key for stopping the operation of such automatic switch in case all the keys are not restored. 17. In a telephone exchange system, a registering yand controlling equipment comprising a plurality of registering and controlling devices, a plurality of keys adapted when depressed to control the registering operation of ysuch registering and control' ling devices, an automatic swltch for simultaneously releasing'the depressed keys and associating said registering and controlling devices with a portion of the apparatus to be controlled, and means controlled by the 18. In a telephone exchange system, a controlling device comprising a plurality of setsl yof keys, means for locking operated keys in their operated position, means for releasing said keys, means for restoring such keys to non-operatedposition, means controlled by theoperation of any key serving to stop the controlling operation of the controlling device until all keys are-restored to non-operated position, and means for indieating. an abnormal delay in the operation of such controlling device.

In 'witness whereof, I hereunto subscribe my name this 27th day of Cctober A. D., 1916.

ALBEN E. LUNDELL. 

